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Date: Sat, 2 Apr 2022 23:06:39 +0800 From: Xu Kuohai <xukuohai@...wei.com> To: Daniel Borkmann <daniel@...earbox.net>, <netdev@...r.kernel.org>, <bpf@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org> CC: Alexei Starovoitov <ast@...nel.org>, Zi Shen Lim <zlim.lnx@...il.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org> Subject: Re: [PATCH bpf-next] bpf, arm64: sign return address for jited code On 4/2/2022 4:22 AM, Daniel Borkmann wrote: > On 3/18/22 11:29 AM, Xu Kuohai wrote: >> Sign return address for jited code when the kernel is built with pointer >> authentication enabled. >> >> 1. Sign lr with paciasp instruction before lr is pushed to stack. Since >> paciasp acts like landing pads for function entry, no need to insert >> bti instruction before paciasp. >> >> 2. Authenticate lr with autiasp instruction after lr is poped from stack. >> >> Signed-off-by: Xu Kuohai <xukuohai@...wei.com> > > This would need a rebase, but please also use the commit description to > provide > some more details how this inter-operates wrt BPF infra such as tail > calls and > BPF-2-BPF calls when we look back into this in few months from now. > > Thanks, > Daniel > . updated in v2, thanks.
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